The few months I bought my 1990 tintop it had vanagon syndrome (bucking
around 2K/3K RPM). I did a good tune up (plugs, injectors etc etc). It got
better but not cured. THen I opened up the AFm and cheand the tracks, added
a capacitor and the syndrome was gone.

https://www.thesamba.com/vw/forum/viewtopic.php?t=377466&postorder=desc

On Mon, Jul 15, 2024 at 1:22 PM Eric Caron <ericcaron96@comcast.net> wrote:

> HI Marcus,
>
>         This is a perfect question for this list.
>
>         Likely there are several things to check.
>
> Did you win one of the gift certificates from Vanagain?  That could help
> with parts.
>
> So,
>
> I am the least qualified to answer, but why should that stop me?
>
> Fuel filter clogged?
> Water in tank from either bad ga or past water event in evaporation tank?
> Charcoal canister, is there suction when you take off the gas cap?
> Only happening when hot, would that be caused by something in the O2
> sensor?
>
> Could try to unplug the sensor just to see if still happens.
>
> And almost last, tune up with new wires.
> And lastly, of course, check all your grounds!
>
> Got a friend with a 2.1 vanagon? Try his AFM.
>
> Maybe when Denis gets home from WRW he can send some ideas.  He is likely
> driving his slightly large van home today.
>
> Eric Caron
>
>
>
>
> > On Jul 15, 2024, at 1:43 PM, Richard Koerner <rjkinpb@SBCGLOBAL.NET>
> wrote:
> >
> > How old is your fuel tank?  Clogged fuel tank outlet will start causing
> these issues.  Was it a hot day?  High ambient temperatures makes it easy
> for Fuel Pump to cavitate; these bubbles in liquid fuel cause loss of power
> and even dying.  Next day after fuel is cold again, the problem
> disappears.  But then you drive again on hot day, and problem reappears as
> gasoline in tank warms up to ambient.  Since fuel tank is downwind of
> radiator, all that hot air flowing by helps also to heat up gasoline.  If
> clogged outlet from old tank, there is no fix; you've got to replace Fuel
> Tank.
> >
> >    On Monday, July 15, 2024 at 10:03:09 AM PDT, Markus Benne <
> mbenne@m-bass.com> wrote:
> >
> >
> > Driving home from WRW, the car had several (usually about once an hour)
> hickup events during the 8 hour drive home.  Sudden momentary loss of power
> and then back to normal.
> > The Bus is a 90 with original 2.1, so it already came from the factory
> with 025.906.302 which is the supposed fix for Vanagon Syndrome.
> > Is it possible that the little pigtail went bad?
> > ...Markus
>